nav .head {
  z-index: 1;
}
nav .head .back {
  width: 20%;
}
nav .head .title {
  width: 60%;
}
main .btn {
  border-radius: 2px;
  border: none;
  background-color: #ccc;
  width: 15px;
  height: 15px;
}
main .work .condition {
  width: 70px;
  height: 25px;
  background-color: #ccc;
  color: #525050;
}
